Apparatus of



PETERS PHOTO-UTHDGRAPMER. WASHINGTON. D cA DANIELTBEADWELL, OF CAMBRIDGE, MASSACHUSETTS.

CONDENSING- APPARATUS 0F STEAM-ENGINES.

Specification of Letters Patent No. 1,534, dated March 81, 1,840.

To @ZZ whom/t may concern Be it known that I, DANL. TRnADwnLn, of Cambridge, in the county of Middlesex and Commonwealth of. Massachusetts, engineer, have invented'y a newland useful Improvement in Steam-Engines kand Methods of Condensing Steam Generally, calledl an Improved Condenser, of whichthe fol;v lowing is a full and exact description.

This condenser is shown in the annexed drawing which makes part of,y this specification. i

Figure l exhibits the head of the condenser as seen upon its side. In Fig. 2 the condenser is seen in section, and Fig. 3 shows the head with the back plate C removed.

The head of the condenser forms t-wo contiguous cavities, made by four equal side-s of cast iron A, A, A, the space inclosed by which is divided by the partition B, and closed .at its ends by the plates C and D firmly secured by screwbolts to the flanges E, E, which make part of the casting A, A.

F, is a pipe of an oblong or oval form co-nnected with the educti-on or exhaust pipe of the steam engine. G is another like pipe communicating with the air pump of the engine. Both of these pipes make part of the casting A, A, as seen at Fig. l.

a a a a, &c., are small pipes or tubes passing from the plate D, to which they are soldered or otherwise well secured by both their ends, one end of each pipe being soldered to the plate D where it covers the condenser head above the partition B, and the other end to the same plate, where it covers the condenser head below the partit-ion B, each pipe being bent or curved, as shown in Fig.

2. In Fig. 3, t-he ends of the pipes are shown as they open into the cavities of the condenser head. I prefer copper or brass as the material for the pipes, and I likewise make the plate D, of a composition of copper and tin in the proportions which form gun metal, the plate C and other parts of the walls of the condenser head being of cast iron. These several parts may, however, be formed of other metals than tho-se here specified.

The condenser, formed upon the plan and according to the directions above given, is to be placed in a vessel which communicates by its botto-1n with a fountain or pump, by which a constant supply'of cold water may be furnished, so as to surround and cover the whole condenser. Cr instead of placing the whole condenser into a vessel vof cold water, said vessel may be so formed that` the plate D, shall constitute one ofitsends; in which case thepipesl or tubes only will be surrounded by thecold'water. p This water as it becomes heated Vby condensing` the steaml must be suffered. toflow fromL the ktop of the vesselwhile a furtherYsupply.0f c old water enters the bottom. Underthese conditions ythe condenser beingv made to com-y municate by the pipe F with the eduction or exhaust pipe, of the engine, and bythe pipe G wit-h the air pump of the same, will be found to operate as follows:

The steam during the motion of the engine constantly flowing from the cylinder to Lso water; which, together with the air which may have been combined with it, is delivered by the pipe G to the air pump, by'which it is discharged to any convenient receptacle, from which it may be again used for supplying or replenishing the boiler as it becomes exhausted.

Instead of using pipes bent or curved, as shown in the drawings, a series of straight pipes may be used having one end of each pipe soldered or connected with and opening to the condenser head, while the other end is made tight or closed up. With this form of pipe the partition B, must be removed, or a. passage for the steam must be made through it, andthe position of' the condenser head must be such that the closed ends of the pipes shall be above the horizontal level of the ends opening into the condenser head, that the water of the con-k densed steam may be discharged to the air pump. I do not consider this form as equal in useful efect to that herein rst specified.

It will be found that with a condenser constructed as first above named a quantity of steam sufficient to form about one gallon of water may be condensed by each hundred square feet ofsurface of A'pipethe tempera-V ture of the steam before condensation being 212 degrees Fah. y

v In claiming Lettersflatentforthefcondenser "as herein described, I Would not be understood as intending my claim to em `and exposed, so that they can be cleaned Without removing any fparton which their Vsupport depends; 5th, theyare, by means of brace the general principle of, condensing by an effusion otwaterupon the condensing vessel, nor for making said. condensing ves-1` sel" ofnumerous ,pipes or tubes instead of onesii'nple cavity, butV Y Y.

:My invention, for'zwhich I claim Letters Patent, consists in-" u .l y

Forming the condenserwith curved pipes, as herein. particularly described, 1which pipes pass from, and return to, the. same plate by Y Which Ythey are supported and which plate covers the two cavities into one Y of Which the steam passesifrom the exhaust pipe of the engine, Yand the otherreceives the Water formed by the condensed steam, this form of construction having the following advantages: 1st,1all thepipes aresup ported byfthev same body; 2d, they are all opened to be cleaned by a removal of the back plate5l3d, l they Fare. free to expand and'contract Withoutfcausing theirends to move5f4th, the outside of the pipes are open being secured by soldering to the plate, placed nearer togetherthan in any" other form of xture.'4 p

In testimony of" alflwvhch II fthe said DANL. TmaADvvnnr,` hereto subscribe my name, in presence of the Witnesseswhose names areV hereto subscribed, on this4 siX- teenth dayv ofy March,` eighteen hundred p and forty.` y p Y Y y x DANL. .TREADWELL HENRY HoNE,

ARTHR L. MoIN'rIRn. 

